WO2010035619A1 - Procédé de production d’objectif de capture optique, moule pour objectif de capture optique et objectif de capture optique - Google Patents

Procédé de production d’objectif de capture optique, moule pour objectif de capture optique et objectif de capture optique Download PDF

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Publication number
WO2010035619A1
WO2010035619A1 PCT/JP2009/065401 JP2009065401W WO2010035619A1 WO 2010035619 A1 WO2010035619 A1 WO 2010035619A1 JP 2009065401 W JP2009065401 W JP 2009065401W WO 2010035619 A1 WO2010035619 A1 WO 2010035619A1
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WO
WIPO (PCT)
Prior art keywords
mold
objective lens
optical
transfer surface
optical pickup
Prior art date
Application number
PCT/JP2009/065401
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English (en)
Japanese (ja)
Inventor
省吾 山本
Original Assignee
コニカミノルタオプト株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by コニカミノルタオプト株式会社 filed Critical コニカミノルタオプト株式会社
Priority to JP2010510579A priority Critical patent/JP4525868B2/ja
Priority to CN2009801375647A priority patent/CN102164728A/zh
Publication of WO2010035619A1 publication Critical patent/WO2010035619A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C2045/4063—Removing or ejecting moulded articles preventing damage to articles caused by the ejector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses

Definitions

  • the present invention relates to an optical pickup objective lens manufacturing method and a molding die, and more particularly to an optical pickup objective lens manufacturing method and a molding die that perform molding using a cavity formed by a pair of molds.
  • the present invention also relates to an optical pickup objective lens obtained by the above manufacturing method and molding die.
  • the first mold As a first manufacturing method of the optical pickup objective lens, after the resin is injected into the cavity formed by the first mold and the second mold and molded, the first mold is separated, By opening the mold and operating the core mold, which is a protruding mechanism provided in the first mold, and protruding the optical function part of the molded product remaining in the first mold to the second mold side There are those that release a molded product from a first mold (see, for example, Patent Document 1).
  • a second manufacturing method after separating the first mold from the second mold and performing mold opening, a plurality of pins which are a plurality of protruding portions provided on the first mold are projected.
  • the mold is released from the first mold by pressing the flange formed on the outer periphery of the optical functional surface of the molded product remaining in the first mold toward the second mold.
  • the core mold is advanced and retracted to project the molded product, the core mold is displaced with respect to the outer peripheral mold side at every molding shot, and the first mold and the first mold are Since the relative shift amount and tilt amount between the optical surfaces existing in each of the two molds change for each shot, there is a problem that the shape accuracy is likely to fluctuate and the coma aberration becomes unstable.
  • an objective lens for optical pickup for example, in the case of a high NA lens having an NA of 0.75 or more, coma aberration generated due to a relative shift or a relative tilt between optical surfaces becomes large.
  • the return of the protruding pin that advances and retreats from the inner surface of the second mold is temporarily deteriorated due to the influence of resin debris, scratches on the sliding portion, etc., after the molded product is released from the mold.
  • the projecting pin protrudes from the second mold and does not return from the state during molding.
  • the pin tip collides with the first mold part, so-called pin galling occurs, and the transfer surface corresponding to the reference mounting surface when the objective lens is assembled is damaged by the pin tip. There is a possibility.
  • the objective lens for optical pickup in particular, in the case of a high NA lens with NA of 0.75 or more, it is necessary to prevent the occurrence of a tilt that causes coma when fixing the objective lens. It is necessary to prevent the occurrence of pin galling that could damage the mounting surface directly affecting the surface.
  • the second manufacturing method it is also conceivable to avoid interference between the tip of the protrusion pin and the mounting surface of the objective lens by arranging the position of the protrusion pin on the outer peripheral side of the mounting surface of the objective lens.
  • the diameter of the objective lens including the flange portion is increased more than necessary as the position of the protruding pin is arranged on the outer peripheral side, which leads to an increase in the size of the objective lens.
  • the objective lens molded by the manufacturing method as described above particularly in the case of a high NA lens with NA of 0.75 or more, has a large thickness for a small optical surface diameter of the lens, and at least one of the optical surfaces is Since the curvature becomes very large, it is desirable to make the flange portion thick in the optical axis direction.
  • the flange is thickened, when resin flows from the gate into the cavity, the flow resistance is reduced in the space corresponding to the flange, and the resin pressure during molding is reduced.
  • a highly accurate objective lens in which the shape of the transfer surface is transferred to can be obtained.
  • the internal pressure remaining in the molded product can be reduced due to the fact that the resin pressure during molding can be reduced as described above, and an objective lens with high heat resistance is provided. can do.
  • the degree of freedom in design is increased such that the thickness of the resin introduction gate can be increased.
  • the present invention provides an objective lens for an optical pickup having a small coma aberration, which can prevent damage to a transfer surface, particularly a transfer surface that transfers a mounting surface, due to pin galling, and is small and highly accurate. It aims at providing a manufacturing method and a shaping die.
  • a method for manufacturing an optical pickup objective lens includes (a) a first step of molding a lens with the first mold and the second mold closed; b) A second step of separating the lens from the second mold by separating the first mold and the second mold, and (c) a first step using an ejection pin provided on the first mold side. A third step of releasing the lens from one mold, and (d) a first mold formed on the optical information recording medium side of the lens. (E) the second mold has a second transfer surface for transferring the second optical surface formed on the light source side of the lens, and an outer periphery than the second optical surface.
  • the third transfer surface for transferring the mounting surface formed on the side, the second transfer surface and the third transfer surface, and the tip of the protrusion pin And having at least a portion than the third transfer surface provided at a position opposed to the projecting first mold side convex portion of.
  • the second mold has the convex portion at a position between the second transfer surface and the third transfer surface and facing the tip surface of the protruding pin, and the convex portion is the third transfer surface. Projecting toward the first mold side, the return of the projecting pin temporarily becomes worse, and the projecting pin protrudes from the inner surface of the first mold and remains in the projecting state and does not return. Even when the mold is closed, the tip surface of the protruding pin hits the convex portion. Therefore, since the sticking pin hits the third transfer surface and can prevent the occurrence of pin galling that damages the third transfer surface, the objective lens for optical pickup after molding and releasing is a precise lens formed by the smooth third transfer surface.
  • the protrusion pin can be disposed relatively inside the second optical surface. Therefore, it is possible to avoid an unnecessarily large size of the optical pickup objective lens.
  • the third transfer surface is arranged at a position recessed from the convex portion on the opposite side to the first mold side, the degree of freedom of the arrangement of the third transfer surface is ensured, and the third transfer surface is arranged from the convex portion.
  • the flange portion of the optical pickup objective lens can be made thicker by arranging it sufficiently deep.
  • the convex portion protrudes toward the first mold side from the position of the outermost periphery of the second transfer surface. In this case, it is possible to avoid interference between the second transfer surface and the tip surface of the protrusion pin.
  • the third transfer surface is provided so as to be depressed on the side opposite to the first mold side from the outermost peripheral position of the second transfer surface.
  • the thickness of the flange portion of the optical pickup objective lens can be reliably increased, and high accuracy and heat resistance can be obtained.
  • the tip surface of the protrusion pin is disposed outside the outermost circumference of the first transfer surface and the second transfer surface. In this case, it is possible to avoid interference between the second transfer surface and the tip surface of the ejection pin, and it is possible to prevent the ejection pin from affecting the central portion having the optical function of the optical pickup objective lens.
  • the convex portion is provided to face a part of the tip surface of the protruding pin.
  • the width or size of the convex portion can be reduced, it is possible to avoid unnecessarily increasing the size of the objective lens for an optical pickup while securing the area of the mounting surface.
  • the second mold includes a core mold provided with the second transfer surface and the third transfer surface, and an outer peripheral mold provided around the core mold.
  • a step is provided in the boundary region between the first transfer surface and the third transfer surface. In this case, it is possible to prevent a burr formed between the core mold and the outer peripheral mold from protruding greatly toward the third transfer surface due to the step.
  • the molding die for an optical pickup objective lens has (a) a first transfer surface for transferring a first optical surface formed on the optical information recording medium side of the lens, and the lens is released.
  • a first mold provided with a projecting pin, (b) a second transfer surface for transferring a second optical surface formed on the light source side of the lens, and an outer peripheral side of the second optical surface.
  • the second die has a convex portion at a position between the second transfer surface and the third transfer surface and facing the tip surface of the protruding pin, and this convex portion is the third transfer surface. Since the protrusion protrudes to the first mold side from the surface, it is possible to prevent the pin pin from hitting the third transfer surface and damaging the third transfer surface. Therefore, the objective lens for optical pickup after molding and release has a precise mounting surface formed by the smooth third transfer surface, and the assembly accuracy of the objective lens for optical pickup can be ensured.
  • the objective lens for an optical pickup includes (a) a first optical surface formed on the optical information recording medium side, and (b) an optical information recording medium side provided on the outer peripheral side with respect to the first optical surface. And an abutting surface having an abutting trace of the ejecting pin, (c) a second optical surface formed on the light source side, and (d) formed on the light source side and on the outer peripheral side with respect to the second optical surface.
  • the back surface position of the abutting surface and a position that overlaps at least a part of the abutting surface when the abutting trace is projected in the optical axis direction It is provided, and it has a crevice which recedes to the butting surface side rather than a mounting surface.
  • the objective lens for an optical pickup is formed by a molding die that prevents the occurrence of pin galling that hits and damages the protruding pin against the third transfer surface. Therefore, the objective lens for optical pickup after molding and release is smooth. It has a precise mounting surface formed by the third transfer surface, and can be assembled with high accuracy.
  • the concave portion is depressed closer to the abutting surface side than the position of the outermost periphery of the second optical surface. In this case, when the objective lens is molded, it is possible to avoid interference between the second transfer surface and the tip surface of the protrusion pin.
  • NA is 0.75 or more and 0.9 or less. Further, when d is the thickness on the optical axis of the objective lens and f is the focal length at the working wavelength of the objective lens, 0.9 ⁇ d / f ⁇ 1.8 is satisfied.
  • the optical pickup objective lens can reduce coma aberration while having a high NA, and can be incorporated into the optical pickup device with high accuracy.
  • FIG. 1 is a view for explaining a molding apparatus for carrying out this manufacturing method
  • FIG. 2A is a fixed mold as a second mold among the molding dies 40 constituting the molding apparatus of FIG.
  • FIG. 2B is an end view of the mold 42 viewed from the A direction
  • FIG. 2B is an end view of the movable mold 41 as the first mold among the molding dies viewed from the B direction.
  • 3 is a side view of the objective lens OL as a molded product
  • FIGS. 4A and 4B are a front view and a back view of the objective lens OL
  • FIG. 5 is a view of the objective lens OL. It is CC sectional drawing.
  • the movable mold 41 and the fixed mold 42 constituting the molding mold 40 can be opened and closed with the parting line PL as a boundary.
  • a cavity CV which is a space formed between both molds 41 and 42 in the mold closed state shown in FIG. 1, corresponds to the shape of the objective lens OL as a molded product.
  • the objective lens OL is made of plastic and includes a circular center portion OLa having an optical function and an annular flange portion OLb extending in the outer diameter direction from the periphery of the center portion OLa.
  • This objective lens OL is a BD objective lens with NA of 0.85.
  • the movable mold 41 is a first mold, and has a structure that enables the mirror core 52 as a movable-side core mold, and the mirror core 52 to be supported around the mirror core 52 and fixed integrally.
  • An outer peripheral mold 51 having a plurality of projecting pins 54 that are released by projecting an objective lens OL as a molded product; and an advancing / retreating drive device 71 that moves the projecting pins 54 forward and backward from the outer peripheral mold 51 toward the fixed mold 42.
  • the outer peripheral mold 51 has an end face 51c that forms a parting line PL. Further, on the center side of the outer peripheral mold 51, a molding surface 51a for defining a flange region CVb in the cavity CV is provided. The molding surface 51a forms the back surface RS and the side surface SS of the flange portion OLb of the objective lens OL by transfer. In the vicinity of the cylindrical core insertion hole 56 provided in the outer peripheral mold 51, a pin insertion hole 55 that supports the protrusion pin 54 and guides the protrusion pin 54 slidably in a direction parallel to the axis AX of the mirror core 52. Are formed at equal intervals.
  • An optical surface molding surface 52a for defining the central region CVa of the cavity CV is provided on the distal end side of the mirror core 52 that is fixed in a state of being inserted into the core insertion hole 56.
  • the optical surface molding surface 52a embodies the first transfer surface, and is formed to be slightly concave, and molds one optical surface LSb of the central portion OLa of the objective lens OL.
  • the optical surface LSb functions as a first optical surface that is disposed to face the BD that is an optical information recording medium during the operation.
  • the mirror core 52 is directly supported and fixed on the base side of the outer peripheral mold 51 by screws or the like (not shown) so that the positional relationship between the optical surface molding surface 52a and the molding surface 51a can be maintained precisely. It has become.
  • a flat circular tip surface 54a that defines a part of the flange region CVb is provided on the tip side of the protruding pin 54 inserted into the pin insertion hole 55 of the outer peripheral die 51.
  • This front end surface 54a is a portion for molding the butting surface PS in the back surface RS of the flange portion OLb of the objective lens OL.
  • the protrusion pin 54 is driven by the advance / retreat drive device 71 and can move along the axis AX1 in the pin insertion hole 55.
  • the objective lens OL is released from the movable mold 41. When moving, it moves forward to the fixed mold 42 side, and moves back to the back side of the movable mold 41 at an appropriate timing after such mold release until mold closing.
  • the protrusion pin 54 is urged in the forward direction on the distal end side by the advance / retreat drive device 71, so that the end of the protrusion pin 54 protrudes from the molding surface 51a by a necessary amount, and the objective lens OL is fixed to the fixed mold.
  • the objective lens OL after molding can be released from the movable mold 41. Note that the position of the protruding pin 54 indicated by a dotted line in FIG. 1 indicates a state in which the movement is restricted by the fixed mold 42, and protrudes beyond this when the objective lens OL protrudes.
  • the tip surface 54a of the protrusion pin 54 is retracted to the position of the molding surface 51a by a return spring (not shown) provided in the forward and backward drive device 71.
  • the protruding pin 54 is accommodated in the outer peripheral mold 51.
  • the molding surface 51 a of the outer peripheral mold 51 is not flat around the core insertion hole 56 and has a plurality of shallow recesses 58 and 59.
  • These concave portions 58 and 59 serve as transfer surfaces for forming low raised portions 18 and 19 provided on the back surface RS of the flange portion OLb of the objective lens OL.
  • These raised portions 18 and 19 prevent the burr 15 as an abutting trace that is inevitably formed on the outer periphery of the abutting surface PS from projecting to the back side from the periphery, and the objective lens OL as a product.
  • the convenience of the handling etc. is aimed at.
  • Two adjacent recesses 59 have a shape different from that of the other recesses 58. This is used to express the directionality of the objective lens OL by the gap between the two recesses 59. In this example, the side opposite to the direction in which the resin injection gate exists by 180 ° is shown by both concave portions 59.
  • the above movable mold 41 moves forward and backward with respect to the fixed mold 42 at an appropriate timing by the mold opening / closing drive device 72.
  • the mold opening / closing drive device 72 moves the movable mold 41 along the axis AX so as to be close to the fixed mold 42 when the mold is closed, so that the molds 41 and 42 are brought into close contact with each other to form the cavity CV.
  • the mold opening / closing drive device 72 performs mold clamping by urging the movable mold 41 to the fixed mold 42 with a necessary pressure when the resin is injected into the cavity CV.
  • the mold opening / closing drive device 72 moves the movable mold 41 so as to be separated from the fixed mold 42 along the axis AX when the mold is opened, and separates the objective lens OL as a molded product from the fixed mold 42. Do the type.
  • the fixed mold 42 is a second mold, and includes a mirror core 62 as a core mold on the fixed side, and an outer peripheral mold 61 having a structure that supports the mirror core 62 and can be fixed integrally. Prepare.
  • mold 61 has the end surface 61c which forms the parting line PL.
  • a molding surface 61a for defining the outermost periphery of the flange region CVb in the cavity CV is provided on the center side of the outer peripheral die 61, that is, the innermost periphery of the end surface 61c.
  • a molding surface 62a for defining the central region CVa and the main portion of the flange region CVb in the cavity CV is provided on the tip side of the mirror core 62 fixed in a state of being inserted into the core insertion hole 66. . a molding surface 62a for defining the central region CVa and the main portion of the flange region CVb in the cavity CV is provided. ing.
  • the molding surface 62a includes an optical surface molding surface S2 corresponding to the optical surface LSa of the center region CVa, a molding surface S3 corresponding to the mounting surface F1 among the surface FS of the flange portion OLb, and the center region CVa and the flange portion OLb. It is comprised by the molding surface S4 corresponding to the recessed part DP formed in the boundary.
  • the optical surface molding surface S2 is a concave surface
  • the optical surface LSa transferred by the optical surface molding surface S2 functions as a second optical surface arranged on the laser light source side for reading or writing during the operation. To do.
  • the radius of curvature of the second optical surface is smaller than the radius of curvature of the first optical surface.
  • the mirror core 62 is directly supported and fixed on the base side of the outer peripheral mold 61 by screws or the like (not shown), so that the positional relationship between the molding surface S3 and the molding surface 61a is maintained precisely. ing.
  • the molding surface S3 is deeper. Is formed. That is, the outermost periphery of the optical surface molding surface S2 protrudes toward the movable mold 41 with respect to the direction of the axis AX, and the molding surface S3 is in a position depressed on the opposite side to the movable mold 41 side. Has been placed. Further, when the position D2 of the outermost periphery of the optical surface molding surface S2 for the optical surface LSa is compared with the position D4 of the molding surface S4, they are formed at the same depth position.
  • the molding surface S3 for the mounting surface F1 is compared with the position D4 of the molding surface S4, the molding surface S3 is formed at a position recessed on the side opposite to the movable mold side 41 side. Yes. That is, the molding surface S4 protrudes toward the movable mold 41 with respect to the direction of the axis AX, and the molding surface S3 is disposed at a position recessed on the opposite side to the movable mold 41 side.
  • the molding surface S4 protrudes beyond the optical surface molding surface S2 that embodies the second transfer surface, and as a result, projects beyond the molding surface S3 that embodies the third transfer surface.
  • the molding surface S3 is sufficiently separated from the movable mold 41.
  • the flange portion OLb has a sufficient thickness at the portion of the mounting surface F1, and the resin injection pressure at the time of molding can be reduced.
  • a thin concave portion DP is formed between the flange portion OLb and the central portion OLa.
  • This concave portion DP corresponds to the provision of the annular convex portion 68 on the tip side of the mirror core 62, and the convex portion
  • the molding surface S4 which is the tip surface of 68 functions as a restricting member that prevents the tip of the protruding pin 54 from coming into contact with the molding surface S3 for the mounting surface F1 when the mold is closed. That is, even if the return of the protruding pin 54 temporarily deteriorates due to the effects of resin waste, scratches on the sliding portion, etc., a part of the tip surface 54a of the protruding pin 54 hits the molding surface S4 of the convex portion 68 and is pushed back. So-called pin galling that damages the molding surface S3 for the mounting surface F1 can be prevented.
  • the convex part 68 cannot make the width
  • the front end surface 54a of the projecting pin 54 is disposed outside the innermost circumference of the molding surface S4 of the convex portion 68, and as a result, more than the outermost circumference of the optical surface molding surface S2 for the optical surface LSa. Arranged outside.
  • the protruding pin 54 is provided on the outer peripheral mold 51 of the movable mold 41 and is disposed outside the outermost outer periphery of the optical surface molding surface 52 a of the mirror core 52. Therefore, it is possible to avoid the protrusion pin 54 from interfering with the optical surfaces LSa and LSb of the objective lens OL, and to prevent the protrusion pin 54 from affecting the optical function of the central portion OLa of the objective lens OL. Yes.
  • the mounting surface F1 is formed as the upper end surface of the annular convex portion 17, and a stepped portion 17 a that is recessed backward is formed on the outermost periphery of the convex portion 17.
  • a stepped portion 67 a protruding toward the movable mold 41 is formed on the outer periphery of the mirror core 62 of the fixed mold 42.
  • the stepped portion 17a obtained by transferring the stepped portion 67a provided on the outer edge of the mirror core 62 has a gap that inevitably exists at the position of the outer periphery 65 of the mirror core 62 because the fixed side has a divided structure of the core type and the outer peripheral type.
  • the burr 25 formed by the resin entering is prevented from projecting to a position higher than the surface side, that is, higher than the mounting surface F1, to facilitate the assembly of the objective lens OL as a product.
  • the protrusion amount of the stepped portion 67a with respect to the molding surface S3 is smaller than the protrusion amount of the convex portion 68 as the limiting member. For this reason, the tip of the protruding pin 54 whose return has deteriorated first hits the convex portion 68 and does not hit the stepped portion 67a. Reducing the amount of protrusion of the stepped portion 67a is advantageous in that the resin injection gate formed between the movable mold 41 and the fixed mold 42 can be thickened.
  • a trace projection unit that projects a burr 15 as an abutment trace of the projection pin 54 from the back toward the optical axis OA on the surface FS of the flange part OLb of the objective lens OL.
  • TP was added. It can be seen that the circular region of the trace projection portion TP and the bottom surface of the recess DP partially overlap.
  • FIG. 6 is a flowchart conceptually illustrating a manufacturing method using the molding apparatus shown in FIG.
  • the movable mold 41 and the fixed mold 42 are heated in advance to a temperature suitable for molding by a mold temperature controller (not shown).
  • a mold temperature controller not shown.
  • dies 41 and 42, or its vicinity is made into the temperature state suitable for shaping
  • the mold opening / closing drive device 72 is operated to advance the movable mold 41 toward the fixed mold 42 to start mold closing (step S11).
  • the mold closing state in which the movable mold 41 and the fixed mold 42 come into contact with each other is achieved.
  • the movable mold Clamping is performed to clamp 41 and the fixed mold 42 with necessary pressure (step S12).
  • an injection device (not shown) is operated to inject the molten resin into the cavity CV between the clamped movable mold 41 and the fixed mold 42 with a necessary pressure through a gate or the like. (Step S13).
  • the molten resin in the cavity CV is gradually cooled by heat radiation, so that the molten resin is solidified to such a degree that it can be released (step S14).
  • the mold opening / closing drive device 72 is operated to retract the movable mold 41 and perform mold opening to separate the movable mold 41 from the fixed mold 42 (step S15).
  • the objective lens OL which is a molded product is released from the fixed mold 42 while being held by the movable mold 41.
  • the advancing / retreating drive device 71 is operated to project the objective lens OL by the ejecting pin 54 (step S16).
  • the four protruding pins 54 are protruded simultaneously, and the flange portion OLb of the objective lens OL is pushed out along the axis AX with good balance.
  • the objective lens OL is urged against the distal end surface of the protruding pin 54 and pushed out toward the fixed mold 42, and the objective lens OL is released from the movable mold 41.
  • the objective lens OL released from both molds 41 and 42 is carried out of the molding apparatus by gripping a sprue portion or the like extending from the gate portion (not shown) of the objective lens OL (step). S17). Further, the objective lens OL after being carried out is subjected to external processing such as removal of the gate portion to be a product for shipment.
  • the fixed mold 42 has the convex portion 68 at a position between the optical surface molding surface 52a and the molding surface S3 and facing the tip surface 54a of the protruding pin 54. Since the convex portion 68 protrudes further toward the movable mold 41 than the molding surface S3, the molds of the two molds 41 and 42 are projected in a state where the protruding pin 54 is poorly returned and protrudes on the inner surface of the movable mold 41. Even when closing or mold clamping is performed, the tip surface 54 a of the protruding pin 54 is pushed back by the convex portion 68.
  • the objective lens OL after molding and releasing has a precise mounting surface F1 formed by the smooth molding surface S3.
  • the assembly accuracy of the objective lens OL for the optical pickup can be secured.
  • the convex portion 68 provided between the optical surface molding surface 52a and the molding surface S3 faces at least a part of the tip surface 54a of the ejection pin 54
  • the ejection pin 54 is used as the optical surface molding surface. It can be arranged relatively inside 52a. Therefore, it is possible to avoid the objective lens OL from becoming unnecessarily large.
  • the molding surface S3 is arranged at a position that is sufficiently retracted from the convex portion 68, the degree of freedom of arrangement of the molding surface S3 is ensured, and the flange portion OLb of the objective lens OL can be made thick.
  • the thickness of the flange portion OLb the thickness of the resin introduction gate (not shown) in the molding die 40 can be increased, and the degree of freedom of the shape can be increased.
  • FIG. 7 is a view for explaining a molding die 40 for carrying out the present manufacturing method.
  • 8A and 8B are a front view and a back view of the objective lens OL
  • FIG. 9 is a CC cross-sectional view of the objective lens OL that is a molded product.
  • the radial width of the flange portion OLb of the objective lens OL is wider than that in the case of the first embodiment.
  • the molding surface S4 that is the top surface of the convex portion 68 functions as a limiting member that prevents the tip surface 54a of the protruding pin 54 from contacting the molding surface S3 for the mounting surface F1 when the mold is closed.
  • the entire tip surface 54a of the protruding pin 54 is not opposed so as to be in contact with the molding surface S4 of the convex portion 68, but is disposed so as to be opposed so that a part of the tip surface 54a can be in contact with the molding surface S4.
  • the front end surface 54a of the protrusion pin 54 is disposed outside the innermost periphery of the molding surface S4 of the convex portion 68, and is disposed outside the outermost periphery of the optical surface molding surface S2 for the optical surface LSa.
  • the protruding pin 54 itself is disposed outside the outermost periphery of the optical surface molding surface 52 a of the mirror core 52. Therefore, the protrusion pin 54 is configured to avoid interference with the optical surfaces LSa and LSb of the objective lens OL.
  • the shape of the convex portion 68 formed on the fixed mold 42 is not limited to the illustrated embodiment, and can be various shapes.
  • the molding surface S4 which is the top surface of the convex portion 68 is not limited to a flat surface perpendicular to the axis AX, but may be a plane slightly inclined or curved with respect to a surface perpendicular to the axis AX. it can.
  • the molding surface S4 which is the top surface of the convex part 68 is made the same height as the outermost periphery of the optical surface molding surface S2, as long as the molding surface S4 protrudes rather than the molding surface S3, a molding surface S4 can be made higher or lower than the outermost periphery of the optical surface molding surface S2.
  • the number of cavities CV provided in the molding die 40 constituted by the fixed die 42 and the movable die 41 is not limited to one, and may be plural. That is, for example, a plurality of mirror cores 62 can be embedded in the outer peripheral mold 61, and a plurality of sets of units including the mirror core 52 and the protruding pins 54 can be embedded in the movable mold 41 correspondingly. In this case, a plurality of objective lenses OL can be obtained by one-shot molding using both molds 41 and 42.
  • the shapes of the optical surface molding surfaces 52a, S2 and the molding surfaces 51a, 62a, S3 on the tip side of the mirror cores 52, 62 shown in FIG. 1 and the like are merely examples, and are appropriately determined according to the use of the objective lens OL. Can be changed.
  • cross-sectional shape, arrangement, the number of components, and the like of the protruding pins 54 described in the above embodiment are merely examples, and can be changed as appropriate.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un procédé de production d’un objectif de capture optique, ledit objectif étant de petites dimensions, présentant un coma, pouvant empêcher des dégâts occasionnés à la surface de transfert par une rayure causée par une broche, et se caractérisant par une haute précision et une résistance élevée à la chaleur malgré ses petites dimensions. L'invention concerne également un moule comprenant un moule fixe (42) muni d’une protubérance (68) formée à une position située en regard de la face (54a) d’extrémité distale d’une broche (54) d’éjection et entre la face (52a) de moulage de la surface optique et la face (S3) de moulage de façon à dépasser en direction du côté d’un moule mobile (41) situé au-delà de la face (S3) de moulage. Même si la fermeture du moule ou le serrage des deux moules (41, 42) est réalisé de telle sorte que la broche (54) d’éjection ne revienne pas normalement en position, mais dépasse jusqu’à la surface intérieure du moule mobile (41), la face (54a) d’extrémité distale de la broche (54) d’éjection est repoussée par la protubérance (68) pour empêcher le rayage par une broche, qui pourrait autrement occasionner des dégâts à la face (S3) de moulage lorsque la broche (54) d’éjection prend appui sur la face (S3) de moulage.
PCT/JP2009/065401 2008-09-29 2009-09-03 Procédé de production d’objectif de capture optique, moule pour objectif de capture optique et objectif de capture optique WO2010035619A1 (fr)

Priority Applications (2)

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JP2010510579A JP4525868B2 (ja) 2008-09-29 2009-09-03 光ピックアップ用対物レンズの製造方法及び光ピックアップ用対物レンズの成形金型、並びに、光ピックアップ用対物レンズ
CN2009801375647A CN102164728A (zh) 2008-09-29 2009-09-03 光拾取用物镜的制造方法、光拾取用物镜的成型模具、光拾取用物镜

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JP2008-251932 2008-09-29
JP2008251932 2008-09-29

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WO2010035619A1 true WO2010035619A1 (fr) 2010-04-01

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013094173A1 (fr) * 2011-12-22 2013-06-27 パナソニック株式会社 Lentille d'objectif, lecteur optique, dispositif à disque optique, moule pour façonnage de résine, et procédé de fabrication d'une lentille d'objectif
WO2015141263A1 (fr) * 2014-03-17 2015-09-24 富士フイルム株式会社 Lentille optique, unité à lentille, module de capture d'image, instrument électronique, moule pour moulage par injection, et procédé de moulage par injection
JP5883989B2 (ja) * 2013-03-26 2016-03-15 富士フイルム株式会社 成形型
JP2017185759A (ja) * 2016-04-08 2017-10-12 キヤノン株式会社 プラスチックレンズおよびその製造方法
JP2022051240A (ja) * 2020-09-18 2022-03-31 富士フイルム株式会社 レンズ、射出圧縮成形用金型及び射出成形品の製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4525868B2 (ja) * 2008-09-29 2010-08-18 コニカミノルタオプト株式会社 光ピックアップ用対物レンズの製造方法及び光ピックアップ用対物レンズの成形金型、並びに、光ピックアップ用対物レンズ
WO2012043224A1 (fr) * 2010-09-30 2012-04-05 コニカミノルタオプト株式会社 Procédé de production d'élément optique
WO2012118041A1 (fr) * 2011-02-28 2012-09-07 コニカミノルタアドバンストレイヤー株式会社 Élément optique, outil de moulage et procédé de production d'un élément optique
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TWM516502U (zh) * 2015-11-03 2016-02-01 Best Prec Ind Co Ltd 光學鏡片及其製造模具
CN106671354B (zh) * 2015-11-11 2019-09-13 伯特光电股份有限公司 光学镜片制造方法、制造模具及其产品
JP2019012112A (ja) 2017-06-29 2019-01-24 日本電産サンキョー株式会社 プラスチックレンズの製造方法
JP2019012110A (ja) * 2017-06-29 2019-01-24 日本電産サンキョー株式会社 レンズユニット
KR102020032B1 (ko) * 2018-12-10 2019-09-10 주식회사 세코닉스 고해상도 광각 렌즈 시스템

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004314545A (ja) * 2003-04-18 2004-11-11 Konica Minolta Opto Inc 光学素子の製造方法及び装置並びに光学素子
JP2004317561A (ja) * 2003-04-11 2004-11-11 Enplas Corp レンズおよびこれを用いた撮像装置
JP2007079150A (ja) * 2005-09-14 2007-03-29 Olympus Corp 成形体、成形体の製造方法及び成形金型
WO2008053692A1 (fr) * 2006-11-01 2008-05-08 Konica Minolta Opto, Inc. Elément optique, matrice métallique de moulage de résine et procédé de fabrication d'un élément optique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4525868B2 (ja) * 2008-09-29 2010-08-18 コニカミノルタオプト株式会社 光ピックアップ用対物レンズの製造方法及び光ピックアップ用対物レンズの成形金型、並びに、光ピックアップ用対物レンズ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004317561A (ja) * 2003-04-11 2004-11-11 Enplas Corp レンズおよびこれを用いた撮像装置
JP2004314545A (ja) * 2003-04-18 2004-11-11 Konica Minolta Opto Inc 光学素子の製造方法及び装置並びに光学素子
JP2007079150A (ja) * 2005-09-14 2007-03-29 Olympus Corp 成形体、成形体の製造方法及び成形金型
WO2008053692A1 (fr) * 2006-11-01 2008-05-08 Konica Minolta Opto, Inc. Elément optique, matrice métallique de moulage de résine et procédé de fabrication d'un élément optique

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013094173A1 (fr) * 2011-12-22 2013-06-27 パナソニック株式会社 Lentille d'objectif, lecteur optique, dispositif à disque optique, moule pour façonnage de résine, et procédé de fabrication d'une lentille d'objectif
JP5883989B2 (ja) * 2013-03-26 2016-03-15 富士フイルム株式会社 成形型
WO2015141263A1 (fr) * 2014-03-17 2015-09-24 富士フイルム株式会社 Lentille optique, unité à lentille, module de capture d'image, instrument électronique, moule pour moulage par injection, et procédé de moulage par injection
US10197760B2 (en) 2014-03-17 2019-02-05 Fujifilm Corporation Optical lens, lens unit, imaging module, electronic apparatus, injection molding mold, and injection molding method
JP2017185759A (ja) * 2016-04-08 2017-10-12 キヤノン株式会社 プラスチックレンズおよびその製造方法
JP2022051240A (ja) * 2020-09-18 2022-03-31 富士フイルム株式会社 レンズ、射出圧縮成形用金型及び射出成形品の製造方法
JP7372890B2 (ja) 2020-09-18 2023-11-01 富士フイルム株式会社 レンズ、射出圧縮成形用金型及び射出成形品の製造方法

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